The Nankana Sahib resident Muslim youth who had incited the mob to pelt stones at Gurdwara Sri Nankana Sahib on January 3, has tendered an apology for his mischievous act of inciting the mob to attack Gurdwara Sri Nankana Sahib and uttering highly inflammatory words against the Sikhs and Gurdwara Sri Janam Asthan Nankana Sahib.